... factors, associated to full factorial design 2k. 399_14784.indd 3338 3338 24/08/19 4:00 PM Thus, the design of experiments proposed is a subset of a full factorial design of n explanatory variables. It is stepwise done, increasing k gradually, starting from k = 1. The experimental planning is considered...

... theoretical and experimental investigations have been performed to analyse the hydraulic fracture initiation and propagation (Olson et al., 2012; Renshaw and Pollard, 1995; Warpinski and Teufel, 1987; Zhou et al,2008). Blanton (1982) conducted a series of experiments on naturally fractured hydrostone blocks...

... Abstract This paper describes the physical laboratory experiment of oil sand under water injection, including experimental device, sample preparation, experimental design, operating procedure and the results of investigation of displacement sand grains of oil sand sample surface using a non...

...-term sustainability of shallow geothermal resources were further aims of the project. Modeling tools included in the COMSOL Multiphysics software package are used for the time-based extrapolation of the performed experiments. The models are assembled by a combination of three-dimensional simulation...

... model for fault seismic rupture. For the case representative of GCS, a felt seismic events (e.g. moment magnitude 4) was calculated, whereas in the case representing shale-gas fracturing and single fracture stimulation experiment for geothermal, only unfelt, smaller magnitude events were calculated...

... of a StoneNode v1.0, a inertial measurement unit designed to the needs of high ruggedness rockfall experiments. This sensor allows to track accelerations up to 400 g and rotations as high as 4000 °/s. Figure 1b shows the deposition pattern of the small rock experimental campaign, highlighting the maximal...

... on both rocks, but the limestone was subjected to a larger panel of experiments (about 1000 thermal cycles, DIC analyses on fracture propagation, damage evaluation with Vp/VS measurements). Several mechanisms may coexist to explain initiation and progressive failure due to temperature variation: thermal...

... with confining pressures of 0 MPa and 0.6 MPa. The experiment measured the length and velocity of cracks propagation under the explosive load. Now, the numerical result is compared with the experimental result. 5.1 Comparative analysis of blasting range According to the experimental result of Yang et al. (2013...

... also from very weak signals not captured by the triggered system (Lopez Comino et al. 2017). 3 EXPERIMENTAL RESULTS Seismic and hydraulic data are summarized in Table 1. For each hydraulic fracturing experiment performed at 410 m depth, the number of experiment (e.g. HF1), the borehole depth (BD...

... the response, considers the interaction among the factors, produces optimal levels, and accurate results. The usage of the experimental design in this paper has the purpose of analyze the parameters that influence the most the fracture width and maximum pressure, and to build optimal experiments to include...

... Abstract Mechanism of slot-shaped borehole breakouts observed in experiments of drilling through high-porosity sandstone is investigated using DEM-continuum mechanics coupled modeling approach. The rock in DEM is modeled as an assembly of particles with flat joints at contacts. The failure...

... in the Äspö Hard Rock Laboratory (HRL), located in the south of Sweden approximately 35 km north of the city of Oskarshamn. The experimental setup and the injection schedules are described in detail in Zang et al. (2017). The experiments were performed in the tunnel TASN in a new drilled horizontal borehole...

..., leading to time dependent strain or creep developed in coal because of bioconversion. 2 EXPERIMENTAL WORK 2.1 Sample preparation and experimental setup The bioconversion experiments conducted as a part of this study was done on coal sample obtained from Herrin seam in the central Illinois coal basin...

... in pipeline operations in frost susceptible soils. reservoir characterization frost heave pore hydrate mip transition evolution gibb-thomson equation freezing experiment upstream oil & gas equation relation variation figure 3 geomaterial plateau sandstone journal nitrogen Rock...

... a drape solution and a rockfall barrier is provided by the so-called attenuator systems. The principle of an attenuator is to intercept the rockfall trajectories and "attenuate" i.e. lessen its kinetic energy, while guiding the rockfall to a designated catchment area. Proof of concept experiments...

... models and laboratory experiments performed on Single cutter machines. Considering the important cost and difficulties to drive experimental tests on these devices the elaborated numerical method could be an interesting alternative to go deeper in the understanding of cutting mechanism. 1 Introduction...

.... Specifically, it is difficult to obtain the result that the numerical and experimental rock specimen will have the same rapid growth of dynamic compressive strength when strain rate increases. To solve this problem, an improved contact model of DEM considering the crack propagation velocity was proposed...

... Ishigaki and Inada granite. These experimental results are also compared with those from static experiments and their implications are discussed. plane discontinuity plane displacement frequency discontinuity saw-cut plane shear strength earthquake reservoir characterization experiment...

... of the rod body, and Pc is the friction between the sleeve and the rod body. 4 WEIGHT-DROPPING TESTS 4.1 The experimental system The experiment was carried out on the drop hammer test system of China University of mining and technology (Beijing). Figure 4 shows the drop hammer test equipment, which...

... to quantize the quartz and calcareous, respectively. 2.2 Equipment and test system The experiment equipment mainly includes the servo pressure system, experimental platform and test system. The experimental platform consists of four correcting wedges, two jacks, four baseboards and outer frame. The pressure...